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1、IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.60,NO.12,DECEMBER20135585EffectofCombinedOutputCapacitorsforStabilityofBuckConvertersWithConstantOn-TimeControlTingQian,WenkaiWu,andWeidongZhuAbstract—Constanton-timecontrolhasbeenwidelyusedforAlternatively,highESRcapacitorsandlowE
2、SRcapacitorspowersupplycontrollersinindustryduetoitsfasttransientarecombinedinmanypracticalapplicationsinordertoachieveresponse.However,existingstabilityanalysisinliteraturescanacompromisebetweenstabilityandlowoutputripplevoltage.onlyexplainconditionswithsingletypeofoutputca
3、pacitorandPreviously,[27]and[28]proposesomesmall-signalmodelingusuallyrecommendhighequivalentseriesresistance(ESR)∗Coforstableoperation.Thispaperproposesanewstabilityanalysisanalysesforconstanton-timecontrolwithcombinedoutputforconstanton-timecontrolwithcombinedoutputcapacit
4、ors,capacitor.However,theresultsstillfocusonsomespecificwhichareoftenusedinpracticalapplications.Basedontime-conditionswhenhighESRisrequiredforstableoperation.domainanalysisfortheinductorcurrent,theoutputvoltage,andThepurposeofthispaperistoexplorestabilitymechanismtheoutputca
5、pacitorcurrents,itisrevealedthathigherESRandforconstanton-timecontrolwithcombinedoutputcapacitors.highercapacitancevaluescandeterioratethestabilityinmanyconditionswithcombinedoutputcapacitors.Also,asimpleloopThedetailedanalysisisderivedbasedontime-domainanalysiscompensations
6、olutionisprovidedtoimprovestability.Simulationfortheinductorcurrent,theoutputvoltage,andtheoutputandexperimentalresultsdemonstratethetheoreticalanalysis.capacitorcurrents.ItisrevealedthathigherESRandhigherIndexTerms—Combinedoutputcapacitors,constanton-timecapacitancevaluesca
7、nalsoleadtoinstabilityinmanycon-control,stability.ditionswhenhavingcapacitorcombination.Specifically,thefollowingnewresultsareachieved.I.INTRODUCTION1)Stabilitycriterionisderivedforconstanton-timecontrolNmodernpowerelectronics,thereisanincreasingdemandwithcombinedoutputcapaci
8、tors.AccordingtodetailedIfortransientperformanceofdcdcconverter.Animportant
